Fahrenheit to Kelvin converter (°F → K)

°F to K formula

Worked example: 410 °F = 483.15 K. The defining value behind this factor is documented on our temperature standards page.

Fahrenheit to Kelvin chart

Includes standard reference values plus the specific numbers people search for most.

Most-searched °F to K answers

When to convert °F to K

• ▸Weather forecasts — Celsius is the global standard; the US still uses Fahrenheit. 20° in one scale feels very different in the other.
• ▸Cooking — oven recipes swap between °C and °F; a 20° setting in one manual matches a different number in another.
• ▸Fever & medical thresholds — 100.4 °F = 38.0 °C is the classic fever cutoff; conversion errors matter clinically.
• ▸Science & chemistry — reactions specify temperature in °C or K; the conversion is fundamental.

Common mistakes

• ✕Applying the wrong direction of the °F/°C formula (many people multiply by 5/9 instead of 9/5).
• ✕Forgetting the +32 offset for Fahrenheit or the +273.15 offset for Kelvin.
• ✕Using degrees Kelvin — Kelvin has no degree symbol (write "300 K", not "300 °K").
• ✕A temperature and a temperature difference convert differently. To convert a reading, use °F = °C × 9/5 + 32. To convert a difference or an interval, drop the offset: a rise of 10 °C is a rise of 18 °F, not 50 °F. This is the single most common temperature conversion error.

Regional usage & source

Celsius is the global standard. Fahrenheit is used in the US. Kelvin is standard in science and engineering.

Reference: °F = °C × 9/5 + 32. Kelvin = °C + 273.15. The Kelvin was redefined in 2019 in terms of the Boltzmann constant (BIPM).

How these numbers are produced and rounded: methodology.

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